A photo posted by Malika (@forevermalika) on Jun 14, 2015 at 4:14pm PDT

According to TMZ, Sangouthai was rushed to an L.A. hospital on Sunday, where he died of a suspected heroin overdose. Authorities have yet to confirm his cause of death.

Khloé remembered her friend, who was a guest star on “Khloé and Lamar,” on Twitter with the message, “when does it stop? RIP Jamie Sangouthai,” she followed up with an Instagram post of a woman crying and the caption, “Life doesn’t get easier but I promise you that life will make you stronger.”

A photo posted by Khloé (@khloekardashian) on Jun 14, 2015 at 11:34pm PDT

Malika Haqq, Khloé’s BFF, shared a throwback picture of the group on Instagram with the message, “Thru good and bad times life shows us every spirit matters and leaves a print on the hearts of others after they have passed... RIP Jamie Sangouthai #GodHelpUsAll”

Jamie and Lamar had a long history. They grew up together in Queens, launched a clothing line called Rich Soil, and Jamie was in Khloé and Lamar’s wedding.